On 7 Jan 2005 at 16:24, Marc Perkel wrote about
"[exim] DNS Question":
| How do you set up an A record to return more than one IP address?
"An" A record contains one IP address, by definition. But you can
have any number of A records owned by the same name. Any type=A
query for the name will return the entire matching set of A records
(just like MX records and most other record types).
| When it
| is set up this way - does it return ALL the IP addresses or randomly
| just one of the list? or is that configurable.
All, in no particular order.
| I have this idea for front end spam filtering servers in diverse
| geographic locations, all on the same name so that the email might go
| randomly to any one of these servers and then funneled securely to the
| "real" server where it is read by the end users.
|
| So - can I do this?
Sure. You can have multiple MX records having the same priority
value, and each of the MX name values can own multiple A records.
I would recommend multiple MX rather than multiple A. You can't rely
on the SMTP clients to notice that there is more than one A record,
which matters if one or more of the hosts is down or unreachable.
- Fred
